Unlock instant, AI-driven research and patent intelligence for your innovation.

Heterojunction photocatalyst for catalytic reduction of CO2, and preparation of heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as low yield and poor catalytic activity, and achieve reduced recombination rate, CO2 The effect of improved restoring ability and low cost

Inactive Publication Date: 2018-11-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, we should note that since g-C alone 3 N 4 As a photocatalyst, photogenerated electron-hole pairs are easy to recombine, so the catalytic activity is not very good, resulting in CH 4 The output is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Heterojunction photocatalyst for catalytic reduction of CO2, and preparation of heterojunction photocatalyst
  • Heterojunction photocatalyst for catalytic reduction of CO2, and preparation of heterojunction photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] g-C 3 N 4 Preparation of powder: Weigh 25g of urea into a glass mortar, grind it hard for 2 hours, transfer it to an alumina crucible, wrap it with aluminum foil and seal it, heat it to 400 degrees at a rate of 16 degrees per minute and then keep it warm for 2 hours , increased to 550°C with the same heating rate and held for another 2 hours. Cool the crucible to room temperature naturally, and grind the obtained light yellow powder, namely g-C 3 N 4 .

[0025] 20wt% Bi 2 o 3 doped g-C 3 N 4 Preparation of heterojunction photocatalyst: Weigh 0.5 g of g-C 3 N 4 , which was dissolved in 60 ml ethylene glycol and sonicated for 30 min to obtain flake g-C 3 N 4 . Subsequently, 0.104 g of Bi(NO 3 ) 3 ·5H 2 O and 1 g of urea, stirred vigorously for 30 min to obtain a homogeneous solution. The solution was hydrothermally treated at 180°C for 12 hours in a Teflon-lined autoclave. The obtained product was washed several times with deionized water and dried at 80-...

Embodiment 2

[0027] Adopt then embodiment 1 identical g-C 3 N 4 The method of preparation differs in that:

[0028] 40wt% Bi 2 o 3 doped g-C 3 N 4 Preparation of heterojunction photocatalyst: Weigh 0.5 g of g-C 3 N 4 , which was dissolved in 60 ml ethylene glycol and sonicated for 30 min to obtain flake g-C 3 N 4 . Subsequently, 0.208 g of Bi(NO 3 ) 3 ·5H 2 O and 1 g of urea, stirred vigorously for 30 min to obtain a homogeneous solution. The solution was hydrothermally treated at 180°C for 12 hours in a Teflon-lined autoclave. The obtained product was washed several times with deionized water and dried at 80-100°C. The hydrothermal product was then calcined in air at 380 °C for 2 hours to finally obtain 40 wt% Bi 2 o 3 doped g-C 3 N 4 heterojunction photocatalysts.

Embodiment 3

[0030] Adopt then embodiment 1 identical g-C 3 N 4 The method of preparation differs in that:

[0031] 60wt% Bi 2 o 3 doped g-C 3 N 4 Preparation of heterojunction photocatalyst: Weigh 0.5 g of g-C 3 N 4 , which was dissolved in 60 ml ethylene glycol and sonicated for 30 min to obtain flake g-C 3 N 4 . Subsequently, 0.312 g of Bi(NO 3 ) 3 ·5H 2O and 1 g of urea, stirred vigorously for 30 min to obtain a homogeneous solution. The solution was hydrothermally treated at 180°C for 12 hours in a Teflon-lined autoclave. The obtained product was washed several times with deionized water and dried at 80-100°C. The hydrothermal product was then calcined in air at 380 °C for 2 hours to finally obtain 60 wt% Bi 2 o 3 Doped g-C 3 N 4 heterojunction photocatalysts.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to a heterojunction photocatalyst for catalytic reduction of CO2, and preparation of the heterojunction photocatalyst. The heterojunction photocatalyst is Bi2O3-doped g-C3N4 heterojunction photocatalyst, wherein the weight percent of the Bi2O3 is 20-80%. A method for preparing the heterojunction photocatalyst is mainly a hydrothermal method; the hydrothermal method comprisesthe steps of fully mixing a precursor of bismuth with g-C3N4 by means of ethylene glycol, washing with water, drying, and then carrying out high-temperature calcination in the air atmosphere. The heterojunction photocatalyst is simple in preparation method and low in cost, thus being suitable for large-scale industrial production. Bismuth compounds are selected to form heterojunction together withC3N4, so that the recombination rate of electron hole pairs is effectively reduced, and the CO2 reduction ability of the photocatalyst is greatly improved.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a 2 Catalytic reduction heterojunction photocatalysts and their preparation. Background technique [0002] In recent years, the continuous development of the industrial field and the serious destruction of forest vegetation have led to CO 2 Emissions are difficult to be effectively controlled, which seriously threatens the survival and development of human beings. Among many solutions, the development of photocatalytic technology is an effective way to solve the problem of carbon dioxide environmental pollution. Currently, the photocatalytic reduction of CO2 into CH 4 The research on useful substances such as cyanide has attracted the attention of research teams from all over the world. Many photocatalysts have been researched and developed by scientists and applied to production and life, among which g-C 3 N 4 It has been widely used because of its suitable bandgap width (2.7eV), ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/39
Inventor 郭瑞堂柳星宇秦浩王忠一施旭唐军英黄春迎刘健孙晓刘帅伟王广涛
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER